chore: group webpack* dependencies for Renovate (#1696)

Author: MikeMcC399

renovate.json

@@ -20,6 +20,11 @@
       "matchDepTypes": ["dependencies"],
       "enabled": false
     },
+    {
+      "matchPackageNames": ["/webpack/"],
+      "groupName": "webpack",
+      "extends": ["schedule:weekly"]
+    },
     {
       "matchPackageNames": [
         "/eslint/",